State Henry’s law and mention two of its important applications.
The relationship between pressure and solubility is guided by Henry’s law. According to this law, “The mass of a gas dissolved in given volume of the liquid at a constant temperature depends upon the pressure which is applied.” It can also be stated as the partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas (χ) in the solution.
where = Henry’s constant.
Applications of Henry’s Law :
(i) To increase the solubility of CO2 in soda water and soft drinks, the bottle is sealed under high pressure.
(ii) At high altitude, low blood oxygen causes climber to become weak and make them unable to think clearly, which are symptoms of a condition known as anoxia.
where = Henry’s constant.
Applications of Henry’s Law :
(i) To increase the solubility of CO2 in soda water and soft drinks, the bottle is sealed under high pressure.
(ii) At high altitude, low blood oxygen causes climber to become weak and make them unable to think clearly, which are symptoms of a condition known as anoxia.
What are the transition elements ? Write two characteristics of the transition elements.
Complete the following chemical equations :
(i) MnO₄⁻(aq) + S₂O₃²⁻(aq) + H₂O(l) →
(ii) Cr₂O₇²⁻(aq) + Fe²⁺(aq) + H⁺(aq) →
The following curve is obtained when molar conductivity is plotted against the square root of concentration, c½ for two electrolytes A and B :
Define the following terms :
(i) Molar conductivity (),
(ii) Secondary batteries.
Name the following :
(i) A transition metal which does not exhibit variation in oxidation state in its compounds.
(ii) A compound where the transition metal is in the +7 oxidation state.
(iii) A member of the lanthanoid series which is well known to exhibit +4 oxidation state.
(iv) Ore used in the preparation of Potassium dichromate.
What is meant by positive deviations from Raoult’s law ? Give an example. What is the sign of H for positive deviation ?